I've been studying all the relevant manuals and have successfully labelled my partition sdd1, which is not at present mounted. It doesn't appear in /etc/mtab, but is shown in /etc/fstab by the line: LABEL=SATABkps /media/sdd1 ntfs-3g rw,uid=1000,nodev,relatime,blksize=4096 0 2. (ntfs-config is installed). Its presence in fstab has not resulted in it being mounted but it may not have been labelled when the PC booted this morning.

Why? The partition appears in "Computer" when I open that in the desktop screen, with its new name, but it refuses to mount directly in spite of its permissions. $ sudo mount -t ntfs-3g /dev/sdd1 and $ sudo mount -t ntfs-3g /SATABkps also fail.

Thanks phonicboom - I have got it mounted now - probably by changing the permissions and/or ownership - can't remember. It appears as Line 19 in fstab, as shown in my post "A little bit of light on fstab!" in the Newbie forum.